Classified for credit

Restored 19th-century railroad complex with working equipment and guided tours — covers railroad history, industrial development, and transportation engineering.

Site of Gen. Robert E. Lee's headquarters during the Battle of Gettysburg — primary-source Civil War command history and battlefield geography.

Gettysburg museum and visitor center adjacent to the battlefield — covers Civil War tactics, turning-point analysis, and the significance of the Gettysburg Address.

Living-history reenactment field near Gettysburg — reinforces Civil War tactics, battlefield geography, and primary-source military history.

Gibbs Farm living-history site near St. Paul depicting 1800s Dakota and pioneer farm life through hands-on demonstrations.

NPS-preserved 13th-century Mogollon cliff dwellings — covers pre-Columbian Indigenous architecture, archaeology, and Southwestern cultural history.

Museum housing Thomas Gilcrease's collection of American West art and Indigenous artifacts — covers U.S. history, westward expansion, and Native American cultures.

Aviation museum on the site of Glenn L. Martin's plant — covers Maryland aviation manufacturing history, aerospace engineering pioneers, and WWII aircraft production.

Outdoor railroad museum with historic locomotives and the presidential car — covers railway history, transportation engineering, and 20th-century civics.

Outdoor living-history park in Golden depicting Colorado frontier life — supports 19th-century Western settlement history and pioneer social studies.

NPS site at Promontory Summit marks the 1869 transcontinental railroad completion — covers industrial engineering history, westward expansion, and labor history.

Reconstructed Arizona gold-rush ghost town with mine tunnel tours — covers hard-rock mining techniques, frontier settlement history, and desert geology.

Reconstructed royal colonial governor's residence in Colonial Williamsburg — covers 18th-century Virginia government, architecture, and British colonial authority.

Former military island in New York Harbor now a national monument — covers colonial, Revolutionary, and Civil War–era military history with harbor geography.

Elvis Presley's estate and museum — covers mid-20th century American cultural history, the rise of rock and roll, and celebrity as social phenomenon.

Memorial state park honoring the 19 Granite Mountain Hotshots — covers wildfire science, emergency response history, and civic sacrifice.

NPS living-history ranch preserving an 1860s–1880s cattle operation — covers ranching economics, westward expansion, and the open-range cattle industry.

Heritage steam and diesel railroad excursions through Grapevine covering Texas railroad history and the role of rail in 19th-century westward expansion.

Operating 1852 grist mill and Underground Railroad site — covers milling mechanics, water-power technology, and abolitionist history.

UNESCO World Heritage Hopewell Ceremonial Earthworks — covers Indigenous archaeology, pre-Columbian North American history, and ancient engineering.

Heritage center documenting Appalachian culture and Cherokee history adjacent to Great Smoky Mountains — pioneer life, indigenous heritage, and regional history.

Mississippian-culture ceremonial mound at Ocmulgee National Park — covers pre-Columbian Indigenous civilizations and archaeological methods.

Preserved 18th-century grist mill complex and working farm — colonial industrial history, milling mechanics, and agricultural heritage.

History center documenting the 1921 Tulsa Race Massacre and the Greenwood District — covers civil rights history, economic history, and systemic racism.